2011-10-25 16:21:06 +00:00
|
|
|
/******************************************************************************
|
|
|
|
|
|
|
|
COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
|
|
|
|
|
|
|
|
This file is part of LibMaxsi.
|
|
|
|
|
|
|
|
LibMaxsi is free software: you can redistribute it and/or modify it under
|
|
|
|
the terms of the GNU Lesser General Public License as published by the Free
|
|
|
|
Software Foundation, either version 3 of the License, or (at your option)
|
|
|
|
any later version.
|
|
|
|
|
|
|
|
LibMaxsi is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
|
|
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
|
|
|
|
more details.
|
|
|
|
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
|
|
along with LibMaxsi. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
|
|
sortedlist.h
|
|
|
|
A container that ensures its elements are always sorted when they are
|
|
|
|
accessed. It also provides binary search.
|
|
|
|
|
|
|
|
******************************************************************************/
|
|
|
|
|
|
|
|
#ifndef LIBMAXSI_SORTEDLIST_H
|
|
|
|
#define LIBMAXSI_SORTEDLIST_H
|
|
|
|
|
|
|
|
#ifndef SIZE_MAX
|
|
|
|
#error Define __STDC_LIMIT_MACROS before including <stdint.h>
|
|
|
|
#endif
|
|
|
|
|
|
|
|
namespace Maxsi
|
|
|
|
{
|
|
|
|
template <class T> class SortedList
|
|
|
|
{
|
|
|
|
public:
|
|
|
|
// GCC appears to be broken as the const in the function pointer typedef
|
|
|
|
// below is ignored for some reason. Is it a compiler bug?
|
|
|
|
typedef int (*compare_t)(const T, const T);
|
|
|
|
|
|
|
|
private:
|
|
|
|
static const int FLAG_SORTED = (1<<0);
|
|
|
|
|
|
|
|
private:
|
|
|
|
T* list;
|
|
|
|
size_t listused;
|
|
|
|
size_t listlength;
|
|
|
|
compare_t comparator;
|
|
|
|
unsigned flags;
|
|
|
|
|
|
|
|
public:
|
|
|
|
SortedList(compare_t thecomparator = NULL) :
|
|
|
|
list(NULL),
|
|
|
|
listused(0),
|
|
|
|
listlength(0),
|
|
|
|
comparator(thecomparator),
|
|
|
|
flags(0)
|
|
|
|
{
|
|
|
|
|
|
|
|
}
|
|
|
|
|
|
|
|
~SortedList()
|
|
|
|
{
|
|
|
|
Clear();
|
|
|
|
}
|
|
|
|
|
|
|
|
public:
|
|
|
|
void SetComparator(compare_t thecomparator)
|
|
|
|
{
|
|
|
|
comparator = thecomparator;
|
|
|
|
flags &= ~FLAG_SORTED;
|
|
|
|
}
|
|
|
|
|
|
|
|
void Clear()
|
|
|
|
{
|
|
|
|
for ( size_t i = 0; i < listused; i++ )
|
|
|
|
{
|
|
|
|
list[i].~T();
|
|
|
|
}
|
|
|
|
|
|
|
|
listused = 0;
|
|
|
|
flags |= FLAG_SORTED;
|
|
|
|
delete[] list;
|
|
|
|
list = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
size_t Length()
|
|
|
|
{
|
|
|
|
return listused;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool Empty()
|
|
|
|
{
|
|
|
|
return !listused;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool IsSorted()
|
|
|
|
{
|
|
|
|
return (flags & FLAG_SORTED);
|
|
|
|
}
|
|
|
|
|
|
|
|
void Sort(compare_t thecomparator)
|
|
|
|
{
|
|
|
|
comparator = thecomparator;
|
|
|
|
Sort();
|
|
|
|
}
|
|
|
|
|
|
|
|
void Sort()
|
|
|
|
{
|
|
|
|
if ( !listused || (flags & FLAG_SORTED) ) { return; }
|
|
|
|
|
|
|
|
MergeSort(0, listused-1);
|
|
|
|
|
|
|
|
flags |= FLAG_SORTED;
|
|
|
|
}
|
|
|
|
|
|
|
|
void Invalidate()
|
|
|
|
{
|
|
|
|
flags &= ~FLAG_SORTED;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool Add(T t)
|
|
|
|
{
|
|
|
|
if ( listused == listlength && !Expand() ) { return false; }
|
|
|
|
|
|
|
|
list[listused++] = t;
|
|
|
|
|
|
|
|
flags &= ~FLAG_SORTED;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
T Get(size_t index)
|
|
|
|
{
|
|
|
|
if ( !(flags & FLAG_SORTED) ) { Sort(); }
|
|
|
|
|
|
|
|
return list[index];
|
|
|
|
}
|
|
|
|
|
|
|
|
// Accesses the elements, but the order might not be sorted.
|
|
|
|
T GetUnsorted(size_t index)
|
|
|
|
{
|
|
|
|
return list[index];
|
|
|
|
}
|
|
|
|
|
|
|
|
T Remove(size_t index)
|
|
|
|
{
|
|
|
|
if ( !(flags & FLAG_SORTED) ) { Sort(); }
|
|
|
|
|
|
|
|
T result = list[listused-1];
|
|
|
|
|
|
|
|
if ( index == listused-1 )
|
|
|
|
{
|
|
|
|
list[--listused].~T();
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
list[index].~T();
|
|
|
|
list[index] = list[--listused];
|
|
|
|
list[listused].~T();
|
|
|
|
flags &= ~FLAG_SORTED;
|
|
|
|
}
|
|
|
|
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
|
|
|
size_t Search(T searchee)
|
|
|
|
{
|
|
|
|
return Search(comparator, searchee);
|
|
|
|
}
|
|
|
|
|
|
|
|
// Returns the index of the element being searched for using the given
|
|
|
|
// comparator, or returns SIZE_MAX if not found.
|
|
|
|
template <class Searchee> size_t Search(int (*searcher)(const T t, const Searchee searchee), const Searchee searchee)
|
|
|
|
{
|
|
|
|
if ( !listused ) { return SIZE_MAX; }
|
2011-11-21 13:56:09 +00:00
|
|
|
if ( !(flags & FLAG_SORTED) ) { Sort(); }
|
2011-10-25 16:21:06 +00:00
|
|
|
|
|
|
|
size_t minindex = 0;
|
|
|
|
size_t maxindex = listused-1;
|
|
|
|
|
|
|
|
do
|
|
|
|
{
|
|
|
|
size_t tryindex = (minindex + maxindex) / 2;
|
|
|
|
const T& t = list[tryindex];
|
|
|
|
int relation = searcher(t, searchee);
|
|
|
|
if ( relation == 0 ) { return tryindex; }
|
|
|
|
if ( relation < 0 ) { minindex = tryindex+1; }
|
|
|
|
if ( relation > 0 ) { maxindex = tryindex-1; }
|
|
|
|
} while ( maxindex + 1 != minindex );
|
|
|
|
|
|
|
|
return SIZE_MAX;
|
|
|
|
}
|
|
|
|
|
|
|
|
private:
|
|
|
|
bool Expand()
|
|
|
|
{
|
|
|
|
size_t newsize = (listused == 0 ) ? 4 : listlength*2;
|
|
|
|
|
|
|
|
T* newlist = new T[newsize*2];
|
|
|
|
if ( !newlist ) { return false; }
|
|
|
|
|
|
|
|
for ( size_t i = 0; i < listused; i++ )
|
|
|
|
{
|
|
|
|
newlist[i] = list[i];
|
|
|
|
list[i].~T();
|
|
|
|
}
|
|
|
|
|
|
|
|
delete[] list;
|
|
|
|
list = newlist;
|
|
|
|
listlength = newsize;
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
|
|
T* GetDestList()
|
|
|
|
{
|
|
|
|
return list + listlength;
|
|
|
|
}
|
|
|
|
|
|
|
|
void MergeSort(size_t minindex, size_t maxindex)
|
|
|
|
{
|
|
|
|
FixupMergeSort(minindex, maxindex);
|
|
|
|
}
|
|
|
|
|
|
|
|
void FixupMergeSort(size_t minindex, size_t maxindex)
|
|
|
|
{
|
|
|
|
MergeSortInternal(minindex, maxindex);
|
|
|
|
|
|
|
|
T* destlist = GetDestList();
|
|
|
|
|
|
|
|
do
|
|
|
|
{
|
|
|
|
list[minindex] = destlist[minindex];
|
|
|
|
} while ( minindex++ != maxindex );
|
|
|
|
}
|
|
|
|
|
|
|
|
void MergeSortInternal(size_t minindex, size_t maxindex)
|
|
|
|
{
|
|
|
|
T* destlist = GetDestList();
|
|
|
|
|
|
|
|
if ( maxindex - minindex == 1 )
|
|
|
|
{
|
|
|
|
if ( 0 < comparator(list[minindex], list[maxindex]) )
|
|
|
|
{
|
|
|
|
destlist[minindex] = list[maxindex];
|
|
|
|
destlist[maxindex] = list[minindex];
|
|
|
|
list[minindex].~T();
|
|
|
|
list[maxindex].~T();
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
destlist[minindex] = list[minindex];
|
|
|
|
destlist[maxindex] = list[maxindex];
|
|
|
|
list[minindex].~T();
|
|
|
|
list[maxindex].~T();
|
|
|
|
}
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( minindex == maxindex )
|
|
|
|
{
|
|
|
|
destlist[minindex] = list[minindex];
|
|
|
|
list[minindex].~T();
|
|
|
|
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
const size_t asize = (maxindex - minindex + 1) / 2 + 1;
|
|
|
|
const size_t bsize = (maxindex - minindex) / 2;
|
|
|
|
const size_t astart = minindex;
|
|
|
|
const size_t bstart = minindex + asize;
|
|
|
|
const size_t aend = minindex + asize - 1;
|
|
|
|
const size_t bend = minindex + asize + bsize - 1;
|
|
|
|
|
|
|
|
FixupMergeSort(astart, aend);
|
|
|
|
FixupMergeSort(bstart, bend);
|
|
|
|
|
|
|
|
destlist += minindex;
|
|
|
|
|
|
|
|
size_t aindex = astart;
|
|
|
|
size_t bindex = bstart;
|
|
|
|
|
|
|
|
while ( aindex <= aend && bindex <= bend )
|
|
|
|
{
|
|
|
|
int relation = comparator(list[aindex], list[bindex]);
|
|
|
|
if ( relation <= 0 )
|
|
|
|
{
|
|
|
|
*destlist++ = list[aindex];
|
|
|
|
list[aindex++].~T();
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
*destlist++ = list[bindex];
|
|
|
|
list[bindex++].~T();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
while ( aindex <= aend )
|
|
|
|
{
|
|
|
|
*destlist++ = list[aindex];
|
|
|
|
list[aindex++].~T();
|
|
|
|
}
|
|
|
|
|
|
|
|
while ( bindex <= bend )
|
|
|
|
{
|
|
|
|
*destlist++ = list[bindex];
|
|
|
|
list[bindex++].~T();
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
};
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif
|
|
|
|
|